Baksan Neutrino Observatory Alert 200512.: Global MASTER-Net observations report

MASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the Baksan Neutrino Observatory Alert 200512. (trigger No 1639958375,03h 35m 12.00s , -72d 30m 00.0s, R=3) errorbox 1 days 74674 sec after notice time and 1 days 75004 sec after trigger time at 2020-05-13 20:49:39 UT, with upper limit up to 18.9 mag. The observations began at zenith distance = 72 deg. The sun altitude is -62.8 deg. The galactic latitude b = -40 deg., longitude l = 288 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1354430 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 161434 | 2020-05-13 20:49:39 | MASTER-SAAO | (03h 44m 19.55s , -74d 03m 43.8s) | C | 60 | 18.6 | 161434 | 2020-05-13 20:49:39 | MASTER-SAAO | (03h 52m 17.31s , -74d 04m 16.7s) | C | 60 | 18.9 | 161933 | 2020-05-13 20:57:58 | MASTER-SAAO | (03h 44m 16.84s , -74d 02m 42.1s) | C | 60 | 18.5 | 161933 | 2020-05-13 20:57:58 | MASTER-SAAO | (03h 52m 14.24s , -74d 03m 16.0s) | C | 60 | 18.9 | 162013 | 2020-05-13 20:59:18 | MASTER-SAAO | (04h 11m 48.61s , -72d 04m 05.5s) | C | 60 | 18.7 | 162013 | 2020-05-13 20:59:18 | MASTER-SAAO | (04h 18m 54.31s , -72d 04m 37.0s) | C | 60 | 18.9 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.